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Early in production, the development team suggested that the game should feature cameos from the Pikmin and Donkey Kong series. Shigeru Miyamoto did not approve of the idea, however.[1] One of the reasons was that the Pikmin's body shape would make them awkward to jump on. This suggests that they would have been featured as enemies or friendly non-playable characters.

Rosalina noticably has a much smaller role in the game, appearing only in the game's first and second endings. This is because Shigeru Miyamoto thought the Storybook in the first game covering her backstory distracted gamers from the first game's gameplay, and made the game focus too much on her instead of the Mario Bros.[citation needed] The game was originally going to have a new subplot involving Rosalina,[citation needed] including exactly how she met Lubba in the first place (which in the final version is reduced to a brief mention by Lubba in the game's ending).

In the debut trailer from E3 2009 and the two Media Summit Trailers, there were several changes before the game's release date. The game was originally going to be called More Super Mario Galaxy.[citation needed]

In Cosmic Cove Galaxy, the switch which freezes the water into ice is placed on a wooden floating platform, similar to the place where Penguru is standing. In the final version, the switch is found on a tower.

Tall Trunk Galaxy's Trunk Slide Planet was apparently its own galaxy. The slide is also made of stone instead of wood.

The fruits that Yoshi can eat to get Star Bits originally looked more like peaches.

After the player fights Giga Lakitu, the entire galaxy can be seen as opposed to only that planet.

When a player used a Dash Pepper, the player did not glow or leave a glowing trail as in the final version.

In the trailer, it can be seen that the Dash Pepper looks more like a berry, and the Blimp Fruit looks like a simple sphere.

A Spin Drill shown on Digga-Leg's planet is always there, even when the player is currently using one. In the final version, they only appear when the player doesn't have one. Additionally, its dome did not crack when Mario attacked it.

In an early version of the Blooming Garden Planet in the Supermassive Galaxy, it was shown that Goombas appeared. In the final version, they don't appear.

In an early version of Cloudy Court Galaxy, it was shown that the cymbal had a checkered-like pattern and that the drums which bounce the player up to the cymbal were red. There were also green mushroom platforms, which were removed from the final version.

It was revealed in ONM that Starship Mario was originally going to be mushroom-shaped.[citation needed]

One trailer showed Yoshi eating a Spiky Plant without having to use the strength to pull. In the final version, Yoshi has to move to eat the Spiky Plants.

When the Airships coming out of worm holes were shown in the E3 trailer, it appeared to be a cutscene rather than actual gameplay.

While the game was in development stages, it was dubbed "Super Mario Galaxy 1.5".

In the Honeybloom Galaxy, a Bee Mushroom is in a octohedron power-up crystal, like in Super Mario Galaxy. In the final version, the power-ups are in neither octohedron crystals, regular crystals, nor the opaque crystals first introduced in Super Mario Galaxy 2.

The early version Snow Field Planet, in Freezy Flake Galaxy was much longer and emptier than the final version.

Sorbetti's Planet had darker bricks in the E3 2009 trailer.

A screenshot showing an unknown platform with Mario jumping on three Twirlips in a row also shows a planet in which resembles none of any of the planets and galaxies in the final release of the game.

There is a planet very similar to the Second Fleet Ship planet in Sky Station Galaxy. The only differences are that there is a Red Koopa Troopa (another early element of SMG2), a few Pull Stars, and one Banzai Bill Blaster instead of just a few.

Another planet is the same as the one in the second mission of Sky Station Galaxy. This planet has hardly changed since earlier versions of the game. The only difference is that there are electric barriers instead of Amps.

Comet Medals were designed differently, as the comet's star had no eyes.

In the Media Summit Gameplay Trailer, it was shown that there was a Piranha Plant in the patch of blue flowers next to the pillar on the Starting Planet of Yoshi Star Galaxy. In the final version, there is an Octoomba.

On the Marble Blocks planet in Yoshi Star Galaxy, the Launch Star is revealed after Yoshi eats the giant fruit, there is a Twirlip instead of a Lakitu and Spiny, and the planet is smaller. In the final version, the Launch Star is in a cage. Page 16 of the game's manual shows a Launch Star misplaced on the Starting Planet in Yoshi Star Galaxy. The Launch Star is supposed to be in a cage near the pillar that has a Comet Medal in the first mission.

In the Hightail Falls Galaxy, on the Slope Planet, it was shown that the big coin would activate a row of Star Bits. In the final version, it was changed to coins.

There are two unused world map songs and an unused galaxy song within the soundtrack. It can be heard here.

Track 9, "Galaxy Song 25", is never played in the game at all in the final release. The game's coding also showed an unused track called "SMG2_galaxy08_strm". This track was scrapped before reaching the orchestra stage, since it is performed with synthesized instruments.

Gobblegut, Digga-Leg/Whomp King, Megahammer, and Glamdozer all have "angry" versions of their music in the game's files[citation needed], but none of them are used, as none of them get angry except Glamdozer, who doesn't have an "angry cutscene". Even so, these fast versions seem unfinished, as they all lack intros.

Although they are not found in the final game, Ice Mario and Flying Mario from the prequel can be playable via hacking.[2]

When defeated and facing down, Whomp King has an otherwise unused expression that can be seen only by hacking.

If the player uses cheats or the infinite flutter jump glitch to go to the Solar System Planet in Yoshi Star's first mission, Goombas can be found.[3] If they are all defeated, a 1-Up Mushroom appears.

Whomp King's face when defeated. Since he faces down when defeated, it's impossible to see his face.